/Engine/Plugins/Developer/Concert/ConcertSync/ConcertSyncClient/Source/ConcertSyncClient/Public/IConcertClientPresenceManager.h
setting presence by name will persist through connection of client using this display name
void SetPresenceVisibility ( const [FString](API\Runtime\Core\Containers\FString) & InDisplayName, bool bVisibility, bool bPropagateToAll )